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Analytical method for determining soil body intensity parameter by in-situ static penetration test

A static penetration and strength technology, applied in the field of foundation soil survey, construction, infrastructure engineering, etc., can solve the problems of unclear penetration mechanism and insufficient application, achieve small error, solve the problem of strength parameters, Intensity parameter accurate effect

Inactive Publication Date: 2011-05-18
SOUTHEAST UNIV
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Problems solved by technology

However, the above methods are mainly regional empirical formulas, the penetration mechanism is not clear, and the application is not wide enough

Method used

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Embodiment Construction

[0015] The in-situ static penetrating test of the present invention determines the analysis method of soil body strength parameter, comprises the following steps:

[0016] Step 1: First establish the numerical analysis model of the static penetration test, in which the Mohr Coulomb model is used for the constitutive of the soil, the elastic model is used for the probe, and the large deformation model is used for the finite element geometric model;

[0017] Step 2: Calculate the minimum error function between the penetration resistance and the measured penetration resistance based on the static penetration test value obtained in the first step as the objective function, and the penetration resistance includes side friction resistance and end resistance;

[0018] The third step: apply the nonlinear optimization algorithm to optimize the objective function of the second step, combine the numerical calculation with the nonlinear optimization inversion method, and make it quickly co...

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Abstract

The invention discloses an analytical method for determining a soil body intensity parameter by an in-situ static penetration test, relating to the technical field of analytical methods for determining soil body intensity parameters by in-situ static penetration tests on the aspect of rock soil. The method comprises the following steps of: firstly, establishing a static penetration test numerical analysis model; taking a minimum error function of static penetration test numerical calculated penetration resistance and actually measured penetration resistance as a garget function, wherein the penetration resistances include lateral friction resistance and end resistance; optimizing the target function by applying a nonlinear optimization algorithm, combining a numerical calculation with a nonlinear optimal inversion method, rapidly converging to a globally optimal solution through repeated iteration; and determining the optimal value of the intensity parameter of soil to be determined, and establishing a correspondence between the actually measured penetration resistance and the soil body intensity parameter, wherein the soil body intensity parameter includes cohesion and internal friction angles. The aims of sensible simulation of the penetration process of a probe in the static penetration test, small errors and accurate and reliable intensity parameter are achieved.

Description

technical field [0001] The invention relates to the technical field of an analysis method for determining soil body strength parameters through an in-situ static penetrating test in rock and soil. [0002] Background technique [0003] Static CPT is to use static force to press the probe into the soil at a constant speed at a constant speed, and continuously measure its penetration resistance (cone head resistance, side wall friction resistance). Static penetration testing is a simple, accurate, fast and economical in-situ testing method for geotechnical engineering. It can be used for: ① Divide the soil layer, determine the soil layer category, find out the uniformity of soft and hard interlayers and soil layers in the horizontal and vertical directions; ② evaluate the engineering characteristics of the foundation soil (allowable bearing capacity, compression properties, undrained shear resistance strength, horizontal consolidation coefficient, saturated sand liquefactio...

Claims

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Application Information

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IPC IPC(8): E02D1/00
Inventor 李仁民刘松玉王强童立元
Owner SOUTHEAST UNIV
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